/Engine/Source/Developer/GeometryProcessingInterfaces/Public/GeometryProcessingInterfaces/CombineMeshInstances.h
FMeshInstanceGroupDatais data shared among one or more FBaseMeshInstances. For example all instances in an ISMC can share a singleFMeshInstanceGroupData.
struct FMeshInstanceGroupData
bool
bAllowMerging
bool
bHasConstantOverrideVertexColor
bool
bPreserveUVs
TArray<UMateri...
MaterialSet
FColor
OverrideVertexColor